Some of the lower res PS3 stuff seems to stem from a slightly closer zoom on the characters the PS3 in some shots that I've seen. They are both the same, now seeing with a 'fresh' pair of eyes. My bad, I was really tired last night.
Although, there does seem to be some subtlties between the two with regards to some of the super effects. Not noticeable when playing, but there all the same. The shot in my last post for example, appears to be taken from the same point in each version identically.
Anyway here's the AF thing:
360
http://img819.imageshack.us/img819/8804/360008.png
http://imageshack.us/photo/my-images/819/360008.png/
PS3
http://img716.imageshack.us/img716/7572/ps3008.png
http://imageshack.us/photo/my-images/716/ps3008.png/
Mod : It'd be easier if you tell people what you looking at. eg. "Notice the grass softness in PS3 version versus XB360 version."